I. ˈbäŋ, ˈbȯŋ noun
Etymology: imitative
Date: 1853
: the deep resonant sound especially of a bell
• bong verb
II. noun
Etymology: Thai buɔŋ hollow piece of wood or bamboo
Date: 1971
: a simple water pipe consisting of a bottle or vertical tube partially filled with a liquid (as water or liqueur) and a smaller offset tube ending in a bowl